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Skeletal Muscle Fiber Location and Arrangement

image descriptionSkeletal muscle fibers are located inside muscles, where they are organized into bundles called image descriptionfascicles (= fasciculi).

 

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  • image descriptionThe epimysium is the connective tissue layer that covers the outer surface of the muscle
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Surrounding and holding together each fascicle is a layer of connective tissue known as image descriptionperimysium.

 

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Portions of the perimysium extend into the fascicle and merge with the image descriptionendomysium, a thin layer of areolar connective tissue that covers each muscle fiber.

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In the deep fascia around the muscles are several large image descriptionarteries, veins, and nerves. Branches of these vessels and nerves penetrate each muscle close to its midpoint, then extend into the epimysium and perimysium layers. In the endomysium, individual muscle fibers (cells) are supported by nearby capillaries and nerve cells.

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Skeletal Muscle Fiber Location and Arrangement